固溶温度对7075铝合金板材组织与力学性能的影响

doi:10.13251/j.issn.0254-6051.2022.03.023

金属热处理 ›› 2022, Vol. 47 ›› Issue (3): 119-123.DOI: 10.13251/j.issn.0254-6051.2022.03.023

固溶温度对7075铝合金板材组织与力学性能的影响

叶拓¹, 唐明^1,2, 刘吉兆¹, 刘伟¹, 吴远志¹, 刘巍¹, 徐文¹

1.湖南工学院汽车零部件技术研究院, 湖南衡阳 421002;
2.湖南工学院建筑工程与艺术设计学院, 湖南衡阳 421002

收稿日期:2021-10-27 修回日期:2021-12-28 出版日期:2022-03-25 发布日期:2022-04-22
通讯作者: 唐明,博士,E-mail:tangming0512@163.com
作者简介:叶拓(1987—),男,副教授,博士,主要研究方向为汽车轻量化材料,E-mail:hnuyetuo@163.com。
基金资助:
湖南省自然科学基金(2018JJ4030,2019JJ30009,2019JJ50110);湖南省科技创新计划(2021RC1008);国家级大学生创新创业训练计划平台(S202111528008);衡阳市科技计划(2020jh012668,2019yj011174)

Effect of solution temperature on microstructure and mechanical properties of 7075 aluminum alloy sheet

Ye Tuo¹, Tang Ming^1,2, Liu Jizhao¹, Liu Wei¹, Wu Yuanzhi¹, Liu Wei¹, Xu Wen¹

1. Research Institute of Automobile Parts Technology, Hunan Institute of Technology,Hengyang Hunan 421002, China;
2. School of Architectural Engineering and Art Design, Hunan Institute of Technology, Hengyang Hunan 421002, China

Received:2021-10-27 Revised:2021-12-28 Online:2022-03-25 Published:2022-04-22

摘要/Abstract

摘要： 对经不同温度固溶处理的7075铝合金板材进行了硬度和压缩试验。采用金相(OM)、电子背散射衍射(EBSD)和透射电镜(TEM)分析了7075铝合金轧板在固溶过程中微观组织的演变。结果表明,随着固溶温度的增加,7075铝合金的硬度和最大压缩强度先增加后减小,在520 ℃条件下固溶时达到峰值,这是由于固溶温度升高,有利于第二相溶入基体,但同时也会出现位错密度下降和晶粒长大等现象。板材的力学性能各向异性随着固溶温度的增加不断减弱,这是由于随着温度的增加,原始的变形纤维组织向等轴晶粒转变,并出现晶粒长大现象,材料的择优取向减弱。

关键词: 固溶处理, 7075铝合金, 力学性能, 微观组织

Abstract: Hardness and compression tests of 7075 aluminum alloy sheet treated by solution treatment at different temperatures were carried out. Microstructure evolution of the rolled 7075 aluminum alloy plate was analyzed by means of optical microscopy (OM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The results show that with the increase of solution temperature, the hardness and maximum compressive strength of the 7075 aluminum alloy first increase and then decrease, which reaches the peak at 520 ℃. This is because the increase of solution temperature is conducive to dissolution of the second phase into the matrix, at the same time, the dislocation density decreases and the grains grow. The anisotropy of mechanical properties of the sheet decreases with the increase of solution temperature. This is because with the increase of solution temperature, the original deformed fiber structure transforms to equiaxed grains, and the phenomenon of grain growth occurs, and the preferred orientation decreases.

Key words: solution treatment, 7075 aluminum alloy, mechanical properties, microstructure

中图分类号:

TG146.2

叶拓, 唐明, 刘吉兆, 刘伟, 吴远志, 刘巍, 徐文. 固溶温度对7075铝合金板材组织与力学性能的影响[J]. 金属热处理, 2022, 47(3): 119-123.

Ye Tuo, Tang Ming, Liu Jizhao, Liu Wei, Wu Yuanzhi, Liu Wei, Xu Wen. Effect of solution temperature on microstructure and mechanical properties of 7075 aluminum alloy sheet[J]. Heat Treatment of Metals, 2022, 47(3): 119-123.

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固溶温度对7075铝合金板材组织与力学性能的影响

Effect of solution temperature on microstructure and mechanical properties of 7075 aluminum alloy sheet

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